/*
   ================================================================
   COMMON.CSS - Shared Styles
   ================================================================
   This file contains styles used across all pages:
   - CSS Variables (custom properties)
   - Reset styles
   - Header and navigation
   - Buttons
   - Forms
   - Footer
   - Toast notifications
   - Modal dialogs
   - Page transitions
   - Responsive design

   Developer: Dominic Appleton
   Student ID: 2102508
   ================================================================
*/


/* ================================================================
   CSS VARIABLES (Custom Properties)
   ================================================================
   Variables store reusable values that can be used throughout CSS.
   This ensures consistency and makes it easy to change colors/sizes.

   Color Theme: Beige / White / Burgundy
   To use a variable: var(--variable-name)
   ================================================================ */
:root {
    /* Color palette - Beige / White / Burgundy theme */
    --primary-bg: #f5f0e8;          /* Warm beige main background */
    --primary-dark: #3d0a14;        /* Deep wine/burgundy for header & footer */
    --burgundy: #800020;            /* Main burgundy accent */
    --burgundy-dark: #5c0015;       /* Darker burgundy for active/pressed states */
    --burgundy-light: #a03040;      /* Lighter burgundy for hover states */
    --cream: #fff8f0;               /* Warm cream for card backgrounds */
    --white: #ffffff;               /* Pure white */
    --off-white: #f9f5ee;           /* Slightly warm off-white */
    --text-primary: #2d1010;        /* Near-black text on light backgrounds */
    --text-secondary: #5a3535;      /* Medium-dark text for secondary content */
    --text-muted: #8a6a6a;          /* Muted text (captions, placeholders) */
    --gray-light: #e8ddd5;          /* Light warm gray for borders */
    --gray: #b8a8a0;                /* Medium warm gray */
    --gray-dark: #7a6060;           /* Darker warm gray */
    --card-bg: #ffffff;             /* White card backgrounds */
    --card-border: #e8ddd5;         /* Subtle card border */

    /* Typography */
    --font-primary: 'Arial', 'Helvetica Neue', sans-serif;

    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 15px;
    --spacing-lg: 20px;
    --spacing-xl: 40px;

    /* Border radius */
    --radius-sm: 5px;
    --radius-md: 10px;

    /* Shadows */
    --shadow-sm: 0 2px 6px rgba(61, 10, 20, 0.1);
    --shadow-md: 0 4px 14px rgba(61, 10, 20, 0.15);
    --shadow-lg: 0 10px 35px rgba(61, 10, 20, 0.2);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.35s ease;
    --transition-slow: 0.5s ease;
}


/* ================================================================
   PAGE TRANSITION - Fade & Slide In on Load
   ================================================================
   Gives every page a smooth entrance animation so that navigation
   feels polished rather than jarring.
   ================================================================ */
@keyframes pageEnter {
    from {
        opacity: 0;
        transform: translateY(18px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Page exit — added by JS before following a link */
@keyframes pageExit {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-12px);
    }
}

body {
    animation: pageEnter var(--transition-slow) ease-out both;
}

body.page-exit {
    animation: pageExit 0.3s ease-in both;
    pointer-events: none;   /* Prevent accidental double-clicks during exit */
}


/* ================================================================
   UNIVERSAL SELECTOR (*)
   ================================================================
   The * selector targets ALL elements on the page.
   This resets default browser styles for consistency.
   ================================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;  /* Makes width/height include padding and border */
}


/* ================================================================
   HTML ELEMENT SELECTOR
   ================================================================
   Element selectors target HTML tags directly.
   ================================================================ */
html {
    scroll-behavior: smooth;  /* Smooth scrolling for anchor links */
}


/* ================================================================
   BODY ELEMENT SELECTOR
   ================================================================
   Sets default styles for the entire page.
   Beige gradient background for a warm, welcoming feel.
   ================================================================ */
body {
    font-family: var(--font-primary);
    font-size: 16px;
    background: linear-gradient(150deg, var(--primary-bg) 0%, var(--off-white) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}


/* ================================================================
   CLASS SELECTOR (.skip-link)
   ================================================================
   Class selectors target elements with a specific class attribute.
   The skip link helps keyboard users navigate past the header.
   ================================================================ */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--burgundy);
    color: var(--white);
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 9999;
    transition: top var(--transition-fast);
}

/* PSEUDO-CLASS SELECTOR (:focus) */
/* Pseudo-classes target elements in a specific state */
.skip-link:focus {
    top: 0;  /* Shows skip link when focused */
}


/* ================================================================
   HEADER ELEMENT SELECTOR
   ================================================================
   Deep wine background keeps the header visually distinct from
   the light beige content area.
   ================================================================ */
header {
    background-color: var(--primary-dark);
    padding: var(--spacing-md) var(--spacing-lg);
    position: sticky;  /* Stays at top when scrolling */
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    border-bottom: 3px solid var(--burgundy);
}


/* ================================================================
   NAVIGATION CONTAINER (Flexbox Layout)
   ================================================================
   Flexbox is used to arrange items in a row.
   justify-content: space-between puts space between items.
   ================================================================ */
.nav-container {
    display: flex;  /* Enables flexbox layout */
    justify-content: space-between;  /* Items at left and right */
    align-items: center;  /* Vertically center items */
    max-width: 1200px;
    margin: 0 auto;
    flex-wrap: wrap;
}


/* ================================================================
   BRAND LOGO SECTION (Flexbox)
   ================================================================ */
.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);  /* Space between logo and text */
    text-decoration: none;
}

/* ID SELECTOR (#logo) */
/* ID selectors target a single unique element */
#logo {
    width: 60px;
    height: auto;
    border-radius: 50%;  /* Makes it circular */
    transition: transform var(--transition-normal);
    border: 2px solid var(--burgundy-light);
}

/* PSEUDO-CLASS: Hover state for logo */
#logo:hover {
    transform: scale(1.1);  /* Slightly enlarge on hover */
}

.brand-name {
    color: var(--cream);
    font-size: 24px;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 2px;
}


/* ================================================================
   NAVIGATION MENU (Flexbox)
   ================================================================ */
nav ul {
    display: flex;
    list-style: none;  /* Remove bullet points */
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

/* DESCENDANT SELECTOR (nav ul li a) */
/* Targets <a> tags inside <li> inside <ul> inside <nav> */
nav ul li a {
    color: var(--gray-light);
    text-decoration: none;
    font-size: 16px;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    transition: all var(--transition-normal);
    position: relative;
}

/* PSEUDO-CLASS: Hover state for nav links */
nav ul li a:hover {
    color: var(--cream);
    background-color: rgba(128, 0, 32, 0.4);
}

/* PSEUDO-ELEMENT (::after) for active link underline */
nav ul li a.active {
    color: var(--cream);
}

nav ul li a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 2px;
    background-color: var(--cream);
    border-radius: 2px;
}


/* ================================================================
   MOBILE MENU TOGGLE BUTTON
   ================================================================ */
.menu-toggle {
    display: none;  /* Hidden on desktop */
    background: none;
    border: none;
    color: var(--cream);
    font-size: 24px;
    cursor: pointer;
}


/* ================================================================
   CONTAINER CLASS
   ================================================================
   Centers content with maximum width.
   ================================================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}


/* ================================================================
   PAGE HEADER SECTION
   ================================================================ */
.page-header {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.page-header h1 {
    color: var(--burgundy);
    font-size: 36px;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    color: var(--text-secondary);
    font-size: 18px;
}


/* ================================================================
   CARD COMPONENT
   ================================================================
   Reusable styled container for content.
   White cards on beige background create clear visual hierarchy.
   ================================================================ */
.card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: var(--spacing-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}


/* ================================================================
   BUTTON STYLES
   ================================================================
   Base button class with modifier classes for different styles.
   ================================================================ */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    text-decoration: none;
    text-align: center;
    transition: all var(--transition-normal);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Primary button - burgundy fill */
.btn-primary {
    background: linear-gradient(135deg, var(--burgundy), var(--burgundy-dark));
    color: var(--white);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--burgundy-light), var(--burgundy));
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

/* Secondary button - outlined burgundy */
.btn-secondary {
    background: transparent;
    color: var(--burgundy);
    border: 2px solid var(--burgundy);
}

.btn-secondary:hover {
    background: var(--burgundy);
    color: var(--white);
    transform: translateY(-2px);
}

/* Gold button - warm cream/amber (used for checkout CTA) */
.btn-gold {
    background: linear-gradient(135deg, #b8860b, #d4a017);
    color: var(--white);
}

.btn-gold:hover {
    box-shadow: 0 0 20px rgba(184, 134, 11, 0.4);
    transform: translateY(-2px);
}

/* Danger button - for destructive actions */
.btn-danger {
    background: #b00020;
    color: var(--white);
}

.btn-danger:hover {
    background: #d00028;
    transform: translateY(-2px);
}

/* Button size modifiers */
.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 14px;
}

.btn-block {
    display: block;
    width: 100%;
}


/* ================================================================
   FORM ELEMENTS
   ================================================================ */

/* Label styling */
label {
    display: block;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    font-weight: bold;
}

/* ATTRIBUTE SELECTOR [type="text"] */
/* Targets input elements with specific type attribute */
input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: var(--spacing-md);
    margin: var(--spacing-sm) 0 var(--spacing-lg);
    background-color: var(--white);
    border: 1px solid var(--gray-light);
    color: var(--text-primary);
    border-radius: var(--radius-sm);
    font-size: 16px;
    font-family: var(--font-primary);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

/* PSEUDO-CLASS: Focus state for inputs */
input:focus,
select:focus,
textarea:focus {
    border-color: var(--burgundy);
    outline: none;
    box-shadow: 0 0 0 3px rgba(128, 0, 32, 0.12);
}

/* PSEUDO-ELEMENT: Placeholder text styling */
input::placeholder,
textarea::placeholder {
    color: var(--gray);
}

/* Error message styling */
.error-message {
    color: #b00020;
    font-size: 14px;
    margin-top: -10px;
    margin-bottom: var(--spacing-sm);
    display: none;
}

.error-message.show {
    display: block;
}

/* Input error state */
.input-error {
    border-color: #b00020 !important;
}

/* Form group container */
.form-group {
    margin-bottom: var(--spacing-md);
}

/* Two-column form row (CSS Grid) */
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;  /* Two equal columns */
    gap: var(--spacing-lg);
}


/* ================================================================
   FOOTER (CSS Grid)
   ================================================================
   Dark wine background echoes the header for visual bookending.
   ================================================================ */
footer {
    background-color: var(--primary-dark);
    padding: var(--spacing-xl) var(--spacing-lg);
    margin-top: auto;
    border-top: 3px solid var(--burgundy);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
}

.footer-section h4 {
    color: var(--cream);
    margin-bottom: var(--spacing-md);
    font-size: 18px;
}

.footer-section p,
.footer-section a {
    color: var(--gray-light);
    font-size: 14px;
    line-height: 1.8;
}

.footer-section a {
    display: block;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--cream);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    border-top: 1px solid rgba(232, 221, 213, 0.2);
    color: var(--gray);
    font-size: 14px;
}


/* ================================================================
   TOAST NOTIFICATION
   ================================================================ */
#toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: var(--white);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--burgundy);
    transform: translateX(150%);  /* Hidden off-screen */
    transition: transform var(--transition-normal);
    z-index: 9999;
}

#toast.show {
    transform: translateX(0);  /* Slides in when shown */
}

#toast.success {
    border-left-color: #2e7d32;
}

#toast.error {
    border-left-color: #b00020;
}


/* ================================================================
   MODAL DIALOG
   ================================================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(61, 10, 20, 0.6);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background-color: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-md);
    max-width: 500px;
    width: 90%;
    transform: scale(0.85);
    transition: transform var(--transition-normal);
    border-top: 4px solid var(--burgundy);
    box-shadow: var(--shadow-lg);
}

.modal-overlay.show .modal {
    transform: scale(1);
}

.modal h2 {
    color: var(--burgundy);
    margin-bottom: var(--spacing-lg);
}

.modal p {
    color: var(--text-secondary);
}

.modal-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: flex-end;
    margin-top: var(--spacing-lg);
}


/* ================================================================
   UTILITY CLASSES
   ================================================================ */
.text-center { text-align: center; }
.text-burgundy { color: var(--burgundy); }
.hidden { display: none !important; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }


/* ================================================================
   RESPONSIVE DESIGN - MEDIA QUERIES
   ================================================================
   Media queries apply styles only at certain screen sizes.
   ================================================================ */

/* Tablet and below (max-width: 950px) */
@media (max-width: 950px) {
    .nav-container {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    nav ul {
        gap: var(--spacing-sm);
    }

    .form-row {
        grid-template-columns: 1fr;  /* Single column on smaller screens */
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

/* Mobile (max-width: 600px) */
@media (max-width: 600px) {
    .menu-toggle {
        display: block;  /* Show hamburger menu */
    }

    nav ul {
        display: none;  /* Hide menu by default */
        flex-direction: column;
        width: 100%;
        text-align: center;
        padding: var(--spacing-md) 0;
    }

    nav ul.show {
        display: flex;  /* Show when toggle clicked */
    }

    .brand-name {
        font-size: 18px;
    }

    .page-header h1 {
        font-size: 28px;
    }
}